Shop Springfield 1911-A1 Mil-Spec 45ACP Stainless Steel and buy guns for sale online from our gun store. A step up form the G.I., the Mil-Spec includes many improvements utilized by the U.S. military during the 1911’s years of service. These features include: High-profile 3-Dot sights, high-hand grip, beveled magazine well, polished feed ramp and throated barrel, lower and flared ejection port and angled slide serrations. The Mil-Spec is a famed war horse among American firearms.